I realized too late that this was book 7 in a series. That probably accounts for my initial difficulty getting hooked into the plot. The book can stand alone; but it helps to have more background for the characters. The book hardly seems to progress. A vague story about the Mahdi Revolt in 1880s Sudan was not what I expected. In fact, the publisher's blurb is entirely incorrect. Gibbons jumping between three different timelines did not help. The historical accuracy of the book does help. It even encouraged me to read further in several spots. But I was bored by the end even though the ending is a cliffhanger.
The book begins by introducing readers to the main characters in the Jack Howard series. It is a packed chapter of each character joking with others about how smart, awesome, and badass they are. It was rushed, it was jumbled, and it tried to pack in 6 previous books' worth of character development. If that was not enough the first few chapters were about an underwater archeological "dig" that unearthed an incredible find. Such a discovery would establish a reputation comparable to Heinrich Schliemann. But, after finally discovering the artifact - not actually bringing it up and studying it - Jack Howard races off to Egypt-Sudan where less impressive discoveries are waiting.
At this point, Gibbons turns the focus of his book into the fictional story of a British railway agent-adventurer-soldier-spook while he treks across the Sudan. With occasional returns to Jack Howard, this book is really devoted to Major Edward Mayne. Mayne's story is much better than Jack's story. It is also slower and more carefully developed. Gibbons probably spends way too much time with Mayne. I appreciate the detail and the history. If the book was just about Mayne, I would rate the book higher. I am not sure how the two plot lines intersect. I was confused by the different artifacts and characters - and lost in the action. Upon reflection, Jack Howard could have done everything without Mayne's story being told intermittently with Howard's story.
Needless to say, none of this has anything to do with the publisher's blurb about a pharaoh sacrificing his army in the Red Sea. The pharaoh appears only once in the book - the first chapter. In this chapter he is likely in modern-day Sudan - but not leading an army into the sea. Nor is there any connection with Tutankhamun, also featured in the blurb. Even though the book was mostly about British efforts to rescue General Gordon in 1884-1885, the book did not contain anything about a "long-shrouded catastrophe" involving a British unit being swallowed by a Nile whirlpool. So, the official description of this book is wildly inaccurate. Possibly, the publisher split Gibbons book in two for better sales....
I appreciate the amount of care and research Gibbons put into the novel. Mayne's story made me want to learn more about the Mahdi Revolt. The realism of the book pushed me further into the book even though I felt the book was interrupted by Jack Howard working on another amazing discovery only to discover it, get the credit, and move on without excavating or cataloging anything. It was awkward. The book ends with Gibbons' musings on the different parts of his book where he delineates fact from fiction and offers some sources and further readings.
The book ends with Howard moving into danger. I am not terribly excited about the next book. The character dynamics is confusing and distracting. Gibbons apparently tried to insert humor into his adventure story; but readers of previous books could appreciate it better. It was more distracting than entertaining. I have no vested interest in Jack, Costas, Hiebermeyer, or anyone else. Mayne's story ends. It appears much of the Mahdi Revolt story ends. The action moves to Egypt. I was skimming the pages by the end, not out of thirst to know what happens; but because I wanted to finish it.
Ultimately, I enjoyed parts of the book and disliked other parts. As a novel of the Mahdi Revolt, this was fascinating and enjoyable. However, interjecting modern Indiana Jones style adventure and archeology made it less enjoyable. If anything, the modern archeology-adventure arc made the Mahdi Revolt arc appear to be filler - extending the story into the next book.